WindowsFormsApplicationBase.Startup Event
Definition
Important
Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.
Occurs when the application starts.
public:
event Microsoft::VisualBasic::ApplicationServices::StartupEventHandler ^ Startup;public event Microsoft.VisualBasic.ApplicationServices.StartupEventHandler Startup;member this.Startup : Microsoft.VisualBasic.ApplicationServices.StartupEventHandler Public Custom Event Startup As StartupEventHandler Public Event Startup As StartupEventHandler Event Type
Examples
This example uses the My.Application.SplashScreen property and the My.Application.Startup event to update the splash screen with status information as the application starts.
Private Sub MyApplication_Startup(
sender As Object,
e As Microsoft.VisualBasic.ApplicationServices.StartupEventArgs
) Handles Me.Startup
' Get the splash screen.
Dim splash As SplashScreen1 = CType(My.Application.SplashScreen, SplashScreen1)
' Display current status information.
splash.Status = "Current user: " & My.User.Name
End Sub
This example requires that the project have a splash screen named SplashScreen1. The splash screen needs to have property named Status that updates its user interface.
You must enter the code in the Code Editor window for application events. To access this window, follow the instructions from this topic's Remarks section. For more information, see Application Page, Project Designer (Visual Basic).
Remarks
A normal (non-single-instance) application raises the Startup event every time it starts. A single-instance application raises the Startup event when it starts only if the application is not already active; otherwise, it raises the StartupNextInstance event. For more information, see StartupNextInstance.
This event is part of the Visual Basic Application model. For more information, see Overview of the Visual Basic Application Model.
You can use the Cancel property of the e parameter to control the loading of an application's startup form. When the Cancel property is set to True, the startup form does not start. In that case, your code should call an alternate startup code path.
You can use the CommandLine property of the e parameter or the CommandLineArgs property to access the application's command-line arguments.
The code for the Startup event handler is stored in the ApplicationEvents.vb file, which is hidden by default.
| To access the Code Editor window for application events |
| 1. With a project selected in Solution Explorer, click Properties on the Project menu. 2. Click the Application tab. 3. Click the View Application Events button to open the Code Editor. For more information, see Application Page, Project Designer (Visual Basic). |
Availability by Project Type
| Project type | Available |
|---|---|
| Windows Forms Application | Yes |
| Class Library | No |
| Console Application | No |
| Windows Forms Control Library | No |
| Web Control Library | No |
| Windows Service | No |
| Web Site | No |
